Mikroelektronika d.o.o.
BT Audio Click Board
BT Audio Click Board
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Overview
The BT Audio Click Board™ is ideal if you are getting tired of all those cables you need just to listen to your favourite song over speakers, what you need is BT Audio Click Board™ with Microchip's RN52 Bluetooth audio module.
With onboard 3.5mm jacks for both a microphone and a speaker, this is a complete solution for streaming audio from a smartphone or PC over a wireless connection.
BLUETOOTH CLASS 2 RADIO AND DSP PROCESSOR COMBINED
Microchip's RN52 Bluetooth audio module delivers high quality audio in small form factor (26.0 mm x 13.5 mm x 2.7 mm). The module combines a class 2 Bluetooth radio and an embedded DSP processor, controlled and configured by simple ASCII commands.
Learn more from the vendor's datasheet.
BT AUDIO CLICK CAN STREAM AUDIO FILES
DSP, or digital signal processor, is what makes this module special, because it can actually stream audio – it converts and compresses the radio waves sent from your phone or computer into digital data, and then sends it to your speakers or headphones.
As a use case example, we built a multimedia station project. Read about it in this tutorial.
QUALITY OF SOUND OVER BLUETOOTH
The module supports aptX, audio codec for high quality stereo audio streaming over a Bluetooth connection. So the quality of the sound is not something you will have to compromise on, as aptX encodes a CD-quality (16-bit / 44.1kHz) audio stream.
The RN52 module supports HSP/HFP, A2DP, AVRCP and SPP, as well as digital I/O, stereo speaker output, stereo microphone input. The module also supports iAP profile discovery for connecting the BT Audio click to Apple devices like, iPods, iPhones or MAC computers.
HSP/HFP stands for Hands-Free Profile and Headset Profile for an audio connection between Bluetooth on your phone and the headset.
BLUETOOTH RANGE
The BT Audio Click Board™ has a 10m range in open space. The range is smaller indoors, but still enough to cover a few rooms.
The BT Audio Click Board™ communicates with the target board MCU through the mikroBUS™ UART interfaces, with few additional pins. The board uses a 3.3V power supply only.
SPECIFICATIONS
| Type | BT/BLE |
| Applications | The BT Audio Click Board™ is ideal for wireless audio docking stations, wireless speakers and headphones, smart medical devices, VoIP handsets, intercom push-to-talk audio connection, etc. |
| On-board modules | Microchip's RN52 Bluetooth audio, 3.5mm jacks for both a microphone and a speaker |
| Key Features | Audio decoders: SBC, AAC, aptX, Embedded Bluetooth profiles: A2DP, AVRCP, HFP/HSP and SPP, Integrated Amplifier for Driving 16Ω Speakers |
| Interface | GPIO,UART |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V |
Pinout Diagram
This table shows how the pinout of the BT Audio Click Board™ corresponds to the pinout on the mikroBUS™ socket.
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Defines baud rate of module | BAUD | 1 | AN | PWM | 16 | CMD | Puts module in command/data operation |
| Reset pin | RST | 2 | RST | INT | 15 | FRS | Factory reset |
| Powers up the module | PWR | 3 | CS | TX | 14 | RX | UART receive |
| NC | 4 | SCK | RX | 13 | TX | UART transmit | |
| NC | 5 | MISO | SCL | 12 | NC | ||
| NC | 6 | MOSI | SDA | 11 | NC | ||
| +3.3V power input | +3.3V | 7 | +3.3V | +5V | 10 | NC | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
CONNECTIVITY TO APPLE DEVICES
The module also supports iAP profile discovery for connecting the BT Audio Click Board™ to Apple devices like iPods, iPhones or MAC computers.
- The RN52 supports HSP/HFP, A2DP, AVRCP and SPP, as well as digital I/O, stereo speaker output, stereo microphone input,up to 11 General Purpose I/O's, and 2 LED status outputs.
- The HSP/HFP stands for Hands-Free Profile and Headset Profile for an audio connection between Bluetooth on your phone and the headset.
The module is fully Bluetooth qualified and provides global modular approval. The ADC can sample up to 200 kHz using different inputs as sample triggers and it supports 8/10/12 bit resolution. Any of the 8 analog inputs can be used both as single-ended inputs and as differential pairs for measuring the voltage across them. The ADC supports full 0 V to VCC input range.
The BT Audio click runs on 3.3V power supply only.
Software Support
The demo is a GUI application made for the mikromedia+ for STM32F7 with a shield. The Application uses BT Audio library to interface between the touch screen and the BT Audio Click Board™ to play music and make phone calls.
The complete project is available on Libstock
CODE SNIPPET
1 void play_btnOnClick()
2 {
3 connection_status_t connection;
4
5 bt_audio_query_connection_status( &connection );
6 if( !connection.A2DP_connection )
7 return;
8 if( music_state_t == PAUSED )
9 {
10 bt_audio_pause_play_track();
11 music_state_t = PLAYING;
12 if( first_song )
13 {
14 get_track_data();
15 first_song = false;
16 }
17 }
18 }
Software Support
The demo is a GUI application made for the mikromedia+ for STM32F7 with a shield. The Application uses BT Audio library to interface between the touch screen and the BT Audio Click Board™ to play music and make phone calls.
The complete project is available on Libstock
CODE SNIPPET
1 void play_btnOnClick()
2 {
3 connection_status_t connection;
4
5 bt_audio_query_connection_status( &connection );
6 if( !connection.A2DP_connection )
7 return;
8 if( music_state_t == PAUSED )
9 {
10 bt_audio_pause_play_track();
11 music_state_t = PLAYING;
12 if( first_song )
13 {
14 get_track_data();
15 first_song = false;
16 }
17 }
18 }
Frequently Asked Questions
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